Datasheet LX5207CDWP Datasheet (Microsemi Corporation)

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LX5207

18-LINE LOW CAPACITANCE, µPOWER SCSI TERMINATOR

5207

THE INFINITE POWER OF INNOVATION

DESCRIPTION

The LX5207 is an eighteen line active ter­minator for the SCSI parallel bus. This SCSI
standard recommends active termination at
both ends of the SCSI bus.

During disconnect mode, the LX5207
requires a meager 500nA of supply current
while offering only 2.5pF of output capaci­tance. To enter this low power mode, the
disconnect pin can be left open (floating)
or driven high thereby disconnecting the
terminating resistors and placing the inter­nal low dropout regulator into low power
mode. In disconnect mode each termina­tion line presents a high impedance to the
SCSI bus with the overall effect being to
preserve high signal integrity and subse­quent reliable, error free communications.

During normal operation, the LX5207
consumes only 800µA of current which is

the lowest enabled supply current of any
terminator available on the market today.
Linfinity's proprietary BiCMOS low dropout
regulator architecture enables this unique
and very efficient operating characteristic.

The LX5207 also offers a precisely
trimmed channel output current specified
to a 5% tolerance. The maximum value
of the output current is trimmed as closely
as possible to the SCSI standard maximum
specification to give the highest possible
noise margin for fast SCSI operation. And
finally, the LX5207 sinks up to 100mA of
current making it compatible with today's
fast active negation drivers.

The LX5207 is a superior, pin-for-pin
replacement for a variety of industry prod­ucts such as the UC5601, UC5602, UC5608,
and UC5609.

PRODUCT HIGHLIGHT

P RODUCTION DATA SHEET

KEY FEATURES

■ 2.5pF OUTPUT CAPACITANCE DURING

DISCONNECT

■ 500nA SUPPLY CURRENT IN DISCONNECT

MODE

■ 800µA SUPPLY CURRENT DURING NORMAL

OPERATION

■ 100mA SINK CURRENT FOR ACTIVE

NEGATION

■ LOGIC COMMAND DISCONNECTS ALL

TERMINATION LINES

■ CURRENT LIMIT AND THERMAL PROTEC-

TION

■ COMPATIBLE WITH SCSI 1, 2, 3, AND

FAST-20 STANDARDS

■ HOT SWAP COMPATIBLE

■ CONSULT FACTORY FOR APPLICATION

TEST REPORT: 5207TR

RECEIVING WAVEFORM - 20MHZ DRIVING WAVEFORM - 20MHZ

Receiver

Driver

1 Meter, AWG 28

LX5207 LX5207

LX5268 LX5268

Discussion On Applying

NOTE:

For An In-Depth

SCSI, Request Linfinity

PACKAGE ORDER INFO

T

(°C)

A

0 to 70 LX5207CDWP

Note: All surface-mount packages are available in Tape & Reel.

Append the letter "T" to part number. (i.e. LX5207CDWPT)

Plastic SOWB

DWP

28-pin, Power

Application Note:

"Understanding The

Single-Ended SCSI Bus"

Copyright © 1998
Rev. 1.5 3/98

FOR FURTHER INFORMATION CALL [phone]

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841

1

LX5207

PRODUCT DATABOOK 1996/1997

18-LINE LOW CAPACITANCE, µPOWER SCSI TERMINATOR

RODUCTION DATA SHEET

P

ABSOLUTE MAXIMUM RATINGS (Note 1)

TermPwr Voltage .................................................................................................+7V

Signal Line Voltage ................................................................................... 0V to +7V

Regulator Output Current ................................................................................... 1.2A

Operating Junction Temperature

Plastic (DWP Package)................................................................................. 150°C

Storage Temperature Range .............................................................. -65°C to 150°C

Lead Temperature (Soldering, 10 seconds) .................................................... 300°C

Note 1. Exceeding these ratings could cause damage to the device. All voltages are with

respect to Ground. Currents are positive into, negative out of the specified
terminal.

THERMAL DATA

DWP PACKAGE:

D

θθ

θ

θθ

JL

x θ

θθ

θ

θθ

JA

).

JA

THERMAL RESISTANCE-JUNCTION TO LEADS,

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

Junction Temperature Calculation: T

numbers are guidelines for the thermal performance of the device/pc-board

The θ

JA

system. All of the above assume no ambient airflow.

= TA + (P

J

18°C/W

40°C/W

POWER UP / POWER DOWN FUNCTION TABLE

Disconnect Outputs

L Enabled 800µA

H HI Z 0.5µA

Open HI Z 0.5µA

Quiescent

Current

PACKAGE PIN OUTS

DISCONNECT

HEAT SINK
HEAT SINK
HEAT SINK

V

128

T1

227

T2

326

T3

425

T4

524

T5

623

722

821

920

T6

10 19

T7

11 18

T8

12 17

T9

13 16

14 15

TERM

DWP PACKAGE

(Top View)

GND
T18
T17
T16
T15
T14
HEAT SINK
HEAT SINK
HEAT SINK
T13
T12
T11
T10
REG OUT

2

Copyright © 1998

Rev. 1.5 3/98

PRODUCT DATABOOK 1996/1997

LX5207

18-LINE LOW CAPACITANCE, µPOWER SCSI TERMINATOR

P RODUCTION DATA SHEET

RECOMMENDED OPERATING CONDITIONS (Note 2)

Parameter

Termpwr Voltage V

Symbol

TERM

Signal Line Voltage

Disconnect Input Voltage

Output Capacitance on REGOUT
Operating Virtual Junction Temperature Range

LX5207C

Note 2. Range over which the device is functional.

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, these specifications apply over the operating ambient temperature range of 0°C ≤ TA ≤ 70°C. Termpwr = 4.75V, Disconnect
= 0V. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)

Parameter

Symbol

Test Conditions Units

Supply Current Section

Termpwr Supply Current All term lines = Open

All term lines = 0.5V

Power Down Mode Disconnect = Open

Output Section (Terminator Lines)

Terminator Impedance I

Terminator Output High Voltage
Max. Output Current V

Output Leakage Disconnect = Open, V
Output Capacitance Disconnect = Open

Sink Current V

= -5mA to -15mA

TERM

= 0.5V, TA = 25°C

OUT

= 0.5V, 0°C ≤ TA ≤ 70°C

V

OUT

V

OUT

V

OUT

OUT

= 0.5V, V
= 0.5V, V

= 4V

= 4V, TA = 25°C

TERM

= 4V, 0°C ≤ TA ≤ 70°C

TERM

= 0V to 5.25V

TERM

Regulator Section

Regulator Output Voltage
Line Regulation V

Load Regulation I
Drop Out Voltage I

Short Circuit Current V

= 4V to 6V

TERM

= 0 to -100mA

REG

= -100mA

REG

= 0V

REG

Thermal Shutdown

Disconnect Section

Disconnect Threshold
Input Current Disconnect = 0V

Recommended Operating Conditions

Min. Typ. Max.

Units

4 5.25 V
05V

0V

TERM

V

4.7 µF

070°C

LX5207

Min. Typ. Max.

0.8 2.0 mA

390 415 mA

0.5 1 µA

100 110 120 Ω

2.7 2.9 V

-20.3 -21.8 -23 mA

-19.0 -21.8 -23 mA

-19.5 -21.8 -23 mA

-18.0 -21.8 -23 mA
10 400 nA

2.5 pF

58 70 mA

3.6 V

10 20 mV
20 50 mV

0.45 1.0 V

-800 -1100 mA
150 °C

0.8 2.0 V

40 µA

Copyright © 1998
Rev. 1.5 3/98

3

LX5207

DISCONNECT

PRODUCT DATABOOK 1996/1997

18-LINE LOW CAPACITANCE, µPOWER SCSI TERMINATOR

RODUCTION DATA SHEET

P

BLOCK DIAGRAM

FIGURE 1 — LX5207 BLOCK DIAGRAM

REG OUT

V

TERM

V

TERM

Channel
1 of 18

5V

4.7µF

DISCONNECT

4.7µF

TERM POWER

V

TERM

LX5207

REGOUT

VBG

APPLICATION SCHEMATIC

FIGURE 2 — 8/16-BIT SCSI SYSTEM APPLICATION

Narrow

~

DB (0)

~

DB (1)

~

DB (14)

~

DB (15)

~

DB (P1)

HOST

PERIPHERAL

Narrow

DB (0)
DB (1)

DB (14)
DB (15)
DB (P1)

V

TERM

TERM POWER

V

TERM

LX5207

REGOUT

T0

T17

4.7µF

4.7µF

5V

DISCONNECTDISCONNECT

V

TERM

TERMPWR

2.2µF

Copyright © 1998

Rev. 1.5 3/98

TERMPWR

DISCONNECT

2.2µF

V

TERM

LX5212

REGOUT

PRODUCTION DATA - Information contained in this document is proprietary to LinFinity, and is current as of publication date. This document
may not be modified in any way without the express written consent of LinFinity. Product processing does not necessarily include testing of
all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.

Wide

~

MSG

~

RST

~

ACK

~

BSY

~

ATN

SCSI CABLE

Wide

MSG

RST

ACK

BSY

ATN

LX5212

REGOUT

4